Dish rack



DI SH HACK June 13. 1932 Bq i @uw Yr mwfiw,

y K M195? Patented July 31, 1934 UNITED STATES PATENT OFFICE incassa msn RACK of Illinois AppucauonJune 13, 1932, serial Nc. 616,790

- 6 Claims.

The presentinvention relates to holders for positioning articles, and has particular reference to improvements in coated ,dish holders or racks and the like. i

It is customary in dishwashing machines to support the dishes to be cleansed in orderly arrangement in wire or openwork` racks. As the dishes are fragile and therefore areapt to be chipped or broken by contact with the metallic rack structure, it is desirable to coat the wire rack with a cushioning means such as a continuous coating of rubber or similar material. This rubber coating valso has the advantage of protecting the metallic wire from rusting and other chemical reactions caused by contact with the cleansing liquids employed in the dishwashing process.

`A primary object of the present invention is to produce a rubber coated rack or the like having thereon a protective coating.

An `additional object is the production of a rubber coated dish rack having a coating containing a phenol condensation product.`

Still another object is to provide a rubber surface with a plasticized phenol `condensation product.

A further object is the provision of a rubber coated metallic surface with a coating of a nexible oil resistant varnish.

These and other objects will become apparent from a consideration of the following description and by reference to the accompanying drawing, in which Fig. 1 is a top view of a dish rack coated in accordance with my invention; and l Fig. 2 is a sectional view taken along line 2-2 of Fig. 1.

In the drawing, the numeral 1 represents a plurality of concentric circular wires arranged at different levels, and the numeral 2 designates a plurality of radial wires which are secured to the circular wires to form a rigid container of such shape as to receive and properly, position a number of dishes to becleansed. The particular configuration of the rack is of no particular concern here, my invention being equally applicable to any structure of this sort.

The wires 1 and 2 are preferably made of some metal such as iron which may be easily bent into the desired shape. After formation of the wires into the shape of the finished rack, the rack is provided with a continuous layer of rubber, as described in Barker patent, No. 1,624,461, and Merseles patent, No. 1,553,624, by any suitable process for forming a continuous layer of rubber on metal. Where the wires cross and are attached together as by spot welding it is important that the rubber form a smooth continuous coating having no cracks or breaks through which water can penetrate;

` In the preferred form of my invention the rubber coating is applied to the metal ,of the rack in sucha manner "as to prevent relative movement between the rubber coating and the metal. That is, the rubber adheres to the metal surface. In addition, the coating is desirably of such a thickness, flexibility and elasticity as to permit a substantial amount of stretching or bending of the same without tearing it loose from the metallic base and without causing a-rupture or break in its surface. A rubber coating of approximately 5l, inch thickness has been found satisfactory.

When used in a dishwashing machine a rubber coated rack is subjected to a spray of hot water,

`which may be near the boilingpoint, containing stances such as sulfur and sulfur compounds used in vulcanization which cause silverware and the like to rapidly tarnish.

In accordance with my invention, the rubber coated surface is provided with a protective coating of a varnish which is resistant to the conditions met with in dishwashing machines.

The varnish which Ihave found particularly desirable for the purpose described contains a phenol condensation product of the so-called Bakelite type in combination with a suitable drying oil, and can be air-dried after application to the rubber. Lacquers or varnish such as customarily used in coating rubber come ofi very rapidly when subjected to the hot alkaline water of a dishwashing machine. Ordinary Bakelite varnish is preferably cured at temperatures so high as to .be detrimental to the rubber of the rack 4and is not sufficiently iiexible to prevent Pounds Phenol formaldehyde resin 1 100 China-wood oil 180 Modified raw linseed oil 20 Manganese resinate 0.78 Lead resinate 1.40 Ethyl ether of ethylene glycol 45 Xylnl 15 Petroleum naphtha 240 In producing the varnish, the phenol formaldehyde resin or Bakelite is mixed with an equal amount of the China-wood or tung oil and held at 400 F. for one hour. The balance of the oil is then added and the temperature of the mixture is again raised to 400 F. in about 15 to 20 minutes and held at that temperature for substantially 30 minutes. The linseed oil and the driers, namely, the manganese resinate`and lead resinate, are then added and the mixture maintained at 400 F. for 30 minutes. After removing the mixture from the source of heat, aboutl 10 gallons of the mineral spirits are added. The remaining portion of the mineral spirits andthe xylol and ethyl ether of ethylene glycol or Cellosolve are then added and the resultant mixture ltered. The cooking or heating during the compounding of the varnish effects an initial oxidation of the varnish, and the metal resinates act as driers for the oil.

It will be seenA that 'the proportions and constituents oi' the preferred formula may be varied from the ngures speciiled, depending upon the particular qualities it is desired to impart to the varnish.

The varnish may be applied to the rubber coated rack `in any suitable manner such as spraying or dipping. After application the varnish will ordinarily form anon-tacky film in about 2 hours and be fairly hard in about 3 hours of air drying.

When properly applied and dried, the varnish forms a tough coating which is resistant to the hot alkaline water of the dishwashing machine. 'I'he oil, grease, and butter which customarily contaminate dirty dishes will rapidly deteriorate the rubber of dish racks, but when coated in ac-A cordance with my invention, the rubber is protected against this action. Silverware is protected by the varnish from the action oi' sulfur contained in the rubber. When the varnish iinally does begin to wear off of the rubber, this action is so slow as to release the harmful constituents of the rubber'at a suiiciently slow rate to prevent substantial discoloration of the silver.

It is evident that my invention may be applied I proportion of about 100 parts oi' the former to about 180 parts of the latter.

3. A dish rack covered with va continuous layer of vulcanized rubber, said rubber being covered by an elastic varnish containing a phenol formaldehyde resin, a drying oil and a drier.

4. A dish rack covered with a continuous layer of vulcanized rubber, said rubber being covered by a varnish containing approximately 100 parts of a phenol formaldehyde resin, 180 parts of China-wood oil, 20 parts of linseed oil, and small quantities of manganese and lead resinates.

5. A dish rack covered with a layer of vulcanized rubber, said rubber being covered with a varnish containing a phenol formaldehyde resin and a sufllcient quantity of a drying oil to cause said varnish to cure Without substantial heating and to render said varnish flexible when cured.

6. A dish rack covered with a continuous layer fof'vulcanized rubber, said rubber being coated tion of tarnish producing compounds in said rubber.

EDGAR S. BTODDARD.

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